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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/100078] New: [11 Regression] Rejected code since
 r11-8137-g84081e2c6bd43a67
Date: Wed, 14 Apr 2021 12:48:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100078

            Bug ID: 100078
           Summary: [11 Regression] Rejected code since
                    r11-8137-g84081e2c6bd43a67
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Keywords: rejects-valid
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: jason at gcc dot gnu.org
  Target Milestone: ---

The following is reduced from webkit2gtk3 package:

$ cat 2to3.ii
template <bool> struct enable_if;
template <typename Data> struct HashMapBucket {
  template <typename T =3D Data>
  static typename enable_if<T ::value>::type selectStructure() {
    selectStructure();
  }
};

$ g++ 2to3.ii -c
2to3.ii: In static member function =E2=80=98static typename enable_if<T::va=
lue>::type
HashMapBucket<Data>::selectStructure()=E2=80=99:
2to3.ii:5:20: error: no matching function for call to
=E2=80=98HashMapBucket<Data>::selectStructure()=E2=80=99
    5 |     selectStructure();
      |     ~~~~~~~~~~~~~~~^~
2to3.ii:4:46: note: candidate: =E2=80=98template<class Data> template<class=
 T> static
typename enable_if<T::value>::type HashMapBucket<Data>::selectStructure()=
=E2=80=99
    4 |   static typename enable_if<T ::value>::type selectStructure() {
      |                                              ^~~~~~~~~~~~~~~
2to3.ii:4:46: note:   template argument deduction/substitution failed:=